California Atty. Gen. Xavier Becerra on Friday filed a lawsuit against the U.S. Environmental Protection Agency, alleging it failed to comply with a request for documents that might indicate whether agency Administrator Scott Pruitt has a conflict of interest.

The lawsuit in federal court in Washington seeks an order to force the EPA to turn over the documents.

Pruitt has stated that he would recuse himself from some cases in which he had sued the EPA while serving as Oklahoma’s attorney general, but a memo released by the agency indicated that Pruitt might not abstain from EPA rulemaking on the same issues that are the subject of his litigation.

Becerra used the Freedom of Information Act to request documents involving the issues on which potential conflicts could exist, but said the papers have not been provided.